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Solution


Q.

Assertion: The flow of energy is unidirectional.
Reason: Energy as it progresses through the various trophic levels is no longer available to the previous level
1 Both assertion and reason are correct and reason is the correct explanation of assertion.  
2 Both assertion and reason are correct but reason is not the correct explanation of assertion.  
3 Assertion is true but Reason is false.  
4 Assertion is false but Reason is true.  

Ans.

(1)

The flow of energy is unidirectional. The energy that is captured by the autotrophs does not revert to the solar input and the energy which passes to the herbivores does not come back to autotrophs. As it moves progressively through the various trophic levels it is no longer available to the previous level. Moreover, the energy available at each trophic level gets diminished progressively due to loss of energy at each level. Thus, both assertion and reason are correct and reason is the correct explanation of the assertion.